Push-button.



No. 825,488. PATENTEDJH'LY 19, 1906.

P. A. $GHNEIDER.

PUSH BUTTON. Yunnan Hum ms. 21. 1905.

all mum's rtrsns co minimum". n. a

UNITED s'rn rns PATENT OFF CE.

I Specification of Letters Patent.

- atented July 10, 1906,

Application filed March EL 1905. Serial No. 261,340.

To all whom it may concern.-

Be it known that I, FREDERICK Auous'r SCHNEIDER, of the city of Toronto,in the count 1 of York and Province of Ontario, Canada, ave inventedcertain new and useful Im rovements in Push-Buttons and Ihereby (lee arethat the following is a full, clear, and exact description of the same.i

This invention relates to a push-button for a three-circuit system-win,a receiving-signal circuit, a transmitting-signal circuit, and acommunicating or talking circuit; and the object of the invention is toso arrange the terminals and contact-points of the push-button that thecircuit of the current can be translated over any one of these threecircuits to operate, respectively, the receivingsignal, thetransmitting-signal, orthe instruments of the communicating or talkingcircuit.

In carrying out the invention the pushbutton is provided with the usualstationary and sprin contact-plates constituting the terminals or thetransmitting-signal circuit which is normally open, and with aninstrument-su porting hook in shunt to the conductor eadin to the springcontact-plate, and a termina to which is adapted to be connected aconductor forming with the condoctor leading to the supporting-hook areceiving-si nal circuit when the instrument is suspends from the hookand with the conductor leading to the springcontaot-plate acommunicating or talking circuit when the instrument has been removedfrom the hook, as hereinafter more fully set forth in the specificationand more out in the claim.

For a full understanding of the invention reference is to be had to thefollowing description and to the accompanying drawings, showing thepush-button used in conjunction with an intercommunicating systeinrFigure 1 is a diagrammatic view showing the push-button installed in acentral station of a three-circuit system. Fig. 2 is an enlarged viewofthe ush-button loo from the front. 3 is an enlarge view looking at itfrom the back. Fig. 4 is a sectional view of the push-button receiverand connecting-cord, showing the receiver upon the hook. Fig. 5 is asimilar view showing the receiver removed. 6 is a vertica. section ofthe push-button.

Like letters of reference refer to like parts throughout thespecification and drawings.

particularly pointed at it One pole a of the'battery b is connected withthe spring contact-plate c by the electrical com uctor d, and in shuntwith the electrical conductor (1 is the signal-conductor 6, leadingthrou h the signal e to the instrument-hook he other pole g of thehattery is connected by an electrical conductor k with the substation i,and the substation i is connected with the terminal by an electricalconductor it. When the instrument 3c is suspended from theinstrument-hook f and the plugs Z and Z of the usual electricalconductors it and Z", res eotively contained in the cord 3c, are insertein the jacks mand m, respectively, the signal-circuit is from the poleat, by means of the conductor d, to the shunt and then through thesignal a over the conductor e to the instrument-hook f, through theinstrument 7c and electrical conductor 1, contained in the flexible cord5%, to the plug 1 and terminal from which it flows by means "of theconductor k to the substation 'i, and

by the electrical conductor h to the other pole g of the battery. Thiscircuit is normally open,

and to close it it is only necessary to operate the push-button o in thesubstation i and bring the terminals for the conductors h and ittogether, which completesthe circuit between the poles a and g of thebattery through the callin -signal 2 of the station 11.

To esta lish a signal-circuit, the sprin contact plate c is moved intocontact wit the stationary contact-plate which is connected b theconductor r t on 11 the signal 8 with the conductor h, and w on the twocontact-plates are together. the, circuit of the current 18 from thepole a over the conductor (1, spring contectlate a to the stationarycontact-plate g, an over the conductor 1' to the signal s at thesubstation i, which it operates so ion as the two contact-plates aretogether, an from the signal s to the conductor k and pole g of thebattery, the resistance in this circuit being less than the resistanceof the circuits hereinbefore and hereinafter described.

The resistance of the conductor lc exceeds the resistance through thesignal e and conductor e and when the instrument is on the hookf thecircuit is through the signal to the hook and then through the conductor1 to the plug 1. and terminal but by removing the instrument k from t ehockf the cireuitthrough the signal e is cut out and a ICOtalking-circuit is established from the pole a to the spring terminalplate 0 by means of the electrical conductor d and from the springterminal plate through the plug I, constantly in contact with it to itsrespective electrical conductor k", contained in the cord is, thenthrough the instrument It and electrical conductor Z to the plug 1 andterminal j, with which the socket m of the plug Z is in constantcontact, and from the terminal to the substation t' by the electricalconductor h through the instrument i when off the hook i to theelectrical conductor h, over which it flows to the other pole g of thebattery.

In the operation of the system when the station p desires to call thestation 1' the operator without removin the instrument It from theinstrument-hoo f presses the plunger t to bring the spring contact-plateinto engagement with the stationary contactplate g, so that the currentcan flow from the ole a to the pole 9 over the circuit formed by theelectrical conductor d, contact-plate c and g, electrical conductor r,signal 8, and electrical conductor h, the signal continuing to operatewhile the contact-plates remain together. When the contact-plates haveagain separated, the calling-signal circuit is broken and thereceiving-signal circuit is established over the conductor d to'theshunt through the signal 6, conductor e to the instrument-hookf andinstrument k to the terminal and then to the pole g, as above describeso that the 0 erator at the substation 1' when his signa has ceasedoperating ss ie can acknowledge the signal from the central station bypressing his push-buttono to close the circuit to the pole g. Bothsubstations are then ready to communicate with one another when bothinstruments are removed from the instrument-hooks.

A push-button constructed and arranged as above outlined will performthe functions which have heretofore been required to be performed by apush-button and switch in systems of this nature.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

A push-button comprising two normally separated contact-platesconstituting the terminals for the conductors of the op osite oles of anelectric circuit, means for h ringing said contact-plates together toclose said circuit an instrument-hook constituting a terminal for aconductor in shunt to the conductor of one of the contact-plates,' twosockets for the push-button, a plug for one of the sockets in clrcuitwith the last-mentioned contact-plate, a plug for the other socket andalterminal in circuit with the last-mentioned p ug.

Toronto, February 25, A. D. 1905.

FREDERICK AUGUST SCHNEIDER.

In presence of L. FLORELLA BROCK, O. H. RIoHEs.

